The invention is directed to fluorinated particles having adsorbent properties for superior performance as the stationary phase for use in chromatographic separations. A long coexistence preamble sequence may be transmitted by a device that has been forced to back off the PLC channel multiple times. , XPath expressions, related to an XML document includes generating a plurality of tokens based on the contents of the XML document. Such sensors may be used for multi-pixel focal arrays and applied for fire detection applications, various space- and military-related applications and other applications. As ultrasound passes through a sheet of material, for example, paper, there is both a phase shift and an amplitude reduction to that ultrasound signal. When the PC card is operationally coupled to the PC card slot, the print engine ready data can be selectively transferred from the PC card to the office machine.